2728781040 has 80 divisors (see below), whose sum is σ = 8561202048. Its totient is φ = 718902528.

The previous prime is 2728781017. The next prime is 2728781051. The reversal of 2728781040 is 401878272.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 2728781040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48574 + ... + 88413.

Almost surely, 2^2728781040 is an apocalyptic number.

2728781040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2728781040 is an abundant number, since it is smaller than the sum of its proper divisors (5832421008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2728781040 is a wasteful number, since it uses less digits than its factorization.

2728781040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137086 (or 137080 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 2728781040 is about 52237.7357855411. The cubic root of 2728781040 is about 1397.4069416392.

The spelling of 2728781040 in words is "two billion, seven hundred twenty-eight million, seven hundred eighty-one thousand, forty".